/*
  ==============================================================================

   This file is part of the JUCE library - "Jules' Utility Class Extensions"
   Copyright 2004-11 by Raw Material Software Ltd.

  ------------------------------------------------------------------------------

   JUCE can be redistributed and/or modified under the terms of the GNU General
   Public License (Version 2), as published by the Free Software Foundation.
   A copy of the license is included in the JUCE distribution, or can be found
   online at www.gnu.org/licenses.

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

  ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.rawmaterialsoftware.com/juce for more information.

  ==============================================================================
*/

#ifndef __JUCE_MEMORYOUTPUTSTREAM_JUCEHEADER__
#define __JUCE_MEMORYOUTPUTSTREAM_JUCEHEADER__

#include "juce_OutputStream.h"
#include "../memory/juce_MemoryBlock.h"
#include "../memory/juce_ScopedPointer.h"


//==============================================================================
/**
    Writes data to an internal memory buffer, which grows as required.

    The data that was written into the stream can then be accessed later as
    a contiguous block of memory.
*/
class JUCE_API  MemoryOutputStream  : public OutputStream
{
public:
    //==============================================================================
    /** Creates an empty memory stream ready for writing into.

        @param initialSize  the intial amount of capacity to allocate for writing into
    */
    MemoryOutputStream (size_t initialSize = 256);

    /** Creates a memory stream for writing into into a pre-existing MemoryBlock object.

        Note that the destination block will always be larger than the amount of data
        that has been written to the stream, because the MemoryOutputStream keeps some
        spare capactity at its end. To trim the block's size down to fit the actual
        data, call flush(), or delete the MemoryOutputStream.

        @param memoryBlockToWriteTo             the block into which new data will be written.
        @param appendToExistingBlockContent     if this is true, the contents of the block will be
                                                kept, and new data will be appended to it. If false,
                                                the block will be cleared before use
    */
    MemoryOutputStream (MemoryBlock& memoryBlockToWriteTo,
                        bool appendToExistingBlockContent);

    /** Destructor.
        This will free any data that was written to it.
    */
    ~MemoryOutputStream();

    //==============================================================================
    /** Returns a pointer to the data that has been written to the stream.

        @see getDataSize
    */
    const void* getData() const noexcept;

    /** Returns the number of bytes of data that have been written to the stream.

        @see getData
    */
    size_t getDataSize() const noexcept                 { return size; }

    /** Resets the stream, clearing any data that has been written to it so far. */
    void reset() noexcept;

    /** Increases the internal storage capacity to be able to contain at least the specified
        amount of data without needing to be resized.
    */
    void preallocate (size_t bytesToPreallocate);

    /** Returns a String created from the (UTF8) data that has been written to the stream. */
    String toUTF8() const;

    /** Attempts to detect the encoding of the data and convert it to a string.
        @see String::createStringFromData
    */
    String toString() const;

    /** Returns a copy of the stream's data as a memory block. */
    MemoryBlock getMemoryBlock() const;

    //==============================================================================
    /** If the stream is writing to a user-supplied MemoryBlock, this will trim any excess
        capacity off the block, so that its length matches the amount of actual data that
        has been written so far.
    */
    void flush();

    bool write (const void* buffer, int howMany);
    int64 getPosition()                                 { return position; }
    bool setPosition (int64 newPosition);
    int writeFromInputStream (InputStream& source, int64 maxNumBytesToWrite);
    void writeRepeatedByte (uint8 byte, int numTimesToRepeat);

private:
    //==============================================================================
    MemoryBlock& data;
    MemoryBlock internalBlock;
    size_t position, size;

    void trimExternalBlockSize();
    void prepareToWrite (int numBytes);

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MemoryOutputStream);
};

/** Copies all the data that has been written to a MemoryOutputStream into another stream. */
OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const MemoryOutputStream& streamToRead);


#endif   // __JUCE_MEMORYOUTPUTSTREAM_JUCEHEADER__
